The FALN’s secret manual – found in the rubble of master bombmaker William Morales’ home – provides detailed instructions for its terrorist members to make bombs, create hysteria and remain undetected.

“The introduction of this set of rules and regulations is done in the interest of preventing errors which traditionally have allowed the enemy to strike death blows to revolutionary organizations,” the manifesto says.

“These rules and regulations are based on years of experience by our organization and other Puerto Rican clandestine organizations.”

The manifesto describes tactics that members “must learn, emulate and practice” to elude detection by maintaining “total secrecy,” being “punctual,” except when being followed or because of illness, and watching what they say because “walls have ears.”

The sophisticated 50-page decree – translated from Spanish by the FBI – provides instructions on when to use telephones, where to hold meetings, what documents to keep and how to protect safe houses “where comrades who are underground stay [and] shall be known only to those to whom the organization assigns such tasks.”

“Notes can’t be taken over surfaces which leaven an imprint, things like magazines, notebooks and paperbacks,” the manual says.

The manifesto also informs terrorists that a guerrilla group “should start out with an operational army of no less than 50 strictly clandestine guerrilla fighters.”

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(Different version in the metro edition on p. 6; HED: FEDS: TERROR TEXTBOOK IS FOUND IN LEADER’S LAIR)